X6 Cannot Access Remote NFSv4 Share

Solved:

I've found that while the ReadyNAS X6 does indeed support NFSv4, apparently FrontView has some separate problems with it. At least as far as the X6 being an NFS client.

My solution applies to the server side of the remote NFSv4 server:
Exporting the share/dir using the version 4 file system in /etc/exports(e.g.)

/var/nfs4exports/exported_directory readynas(rw,no_root_squash,sync)

(where /var/nfs4exports is the root of the exported NFSv4 file system) does not work for the ReadyNAS client.

Instead, I had use the NFSv3/2 style just for the X6 (e.g.)

/exported_directory readynas(rw,no_root_squash,sync)

in a separate export line.

Normally, I would export exported_directory to the X6's entire subnet like this:

/var/nfs4exports/exported_directory 192.168.7.0(rw,sync)

But now I have to export that directory to each box on the subnet explicitly, since if one exports the NFSv4 file system to the whole subnet, and then exports the same directory to a specific NFSv3 box on that same subnet, NFS uses the first export (i.e. the v4 one) and ignores the other one.

So, this works (where 192.168.7.201 is the X6):

### For NFSv4 clients
/var/nfs4exports/exported_directory 192.168.4.0/24(rw,sync)\
                      192.168.5.0/24(rw,sync)\
                      192.168.7.202(rw,sync)\
                      192.168.7.203(rw,sync)\
                      192.168.8.0/24(rw,sync)\
                      192.168.10.0/24(rw,sync)\
                      192.168.7.207(rw,sync,insecure)\

### Export to an NFSv3 client
/exported_directory 192.168.7.201(rw,sync,no_root_squash)

This does not work:

/var/nfs4exports/home 192.168.7.0/24(rw,sync)
/home 192.168.7.201(rw,sync,no_root_squash)

as NFS sees that both exports are in the same subnet, and so uses only the first entry.

I'm wondering if FrontView does not properly see the NFS remote host as a version 4 server. If the NFS version can't be automatically detected by FrontView, then there should probably be an option to the Backup dialogs to specify the NFS version explicitly. Because I only use my X6 as a backup server, I suppose I could just add an entry in /etc/fstab to mount my remote server at boot time, but I don't know if that change will persist on reboot of the NAS.